The court and China are fighting to the death, but Lu Zhi was called to Guan's house for tea.

Rarely, this time it was not Lu Zhi who praised General Guan, but General Guan who praised Lu Zhi, and this tea was very comfortable to drink.

"Benefiting the country and the people, haha, good!" General Guan slapped Lu Zhi on the face, hitting him and staggering.

It is said that the old general retired only when he was ill, but you look at his strength like an ox, where does he look like a patient?

Anyway, Lu Zhi thinks that he is more like a patient than the two, no, a sick cat.

"It's okay, it's pretty sturdy." General Guan was quite satisfied after filming, "Do you know why I called you here?" ”

Lu Zhi arched his hand, "Please also ask the old man to teach." ”

"Hmm." General Guan pointed to his seat and motioned to sit down first, "You did a good job, but you were too sharp, so you still have to be more restrained." ”

"Yes, the kid has written it down, Mu Xiu will be destroyed by the forest wind, and the kid still understands it."

"It's good to understand." Old General Guan sighed, "Hey, the example of the Yan family is right in front of you, you have to pay attention." ”

"Yes." As the saying goes, if you don't listen to the old man, you will suffer in front of you, and Lu Zhi still understands this truth.

General Guan nodded, "Actually, I'm not worried about this, you are stronger than your father, just talk about Yantian, it's very good." ”

Lu Zhi just smiled, he couldn't answer it.

But when it comes to Yantian, he is still a little complacent.

Although in the long run, the silver will be less profitable, but in this way, the risk is also small!

The tragic end of the Yan family is just around the corner, how can Lu Zhi repeat the mistakes of the past?

"Hehe~~~" Old General Guan saw Lu Zhi's color, chuckled and shook his head, "Not bad, it's good, but it's not perfect, there are still some small flaws." ”

Lu Zhi heard the strings and knew what he meant, "You mean the two million taels of silver you earned from making salt fields?" ”

"Yes!" General Guan opened his palm, "The wealth is not exposed, this silver is too much, it will burn its hands." ”

Lu Zhi's eyes narrowed slightly, "Actually, the kid has thought about it, I originally wanted to use this silver to buy the Yan family's salt farm, so that I can turn this huge wealth into darkness." ”

"What a hand, turning light into darkness!" General Guan was quite satisfied, "The Lu family's Xiaozhi is really smart. ”

Lu Zhi scratched his head and smirked twice, "But didn't you just let me keep a low profile, it's a bit troublesome." ”

"There's no rush to this." General Guan waved his hand, "Your method of drying salt should be more effective than the Yan family's method, but why do you still need the Yan family's salt field?" Just to turn light into darkness? ”

"Of course not, the old man doesn't know." Lu Zhi borrowed the pen and ink in the house, "The kid has sent someone to investigate, and the Yan Clan's salt field is very likely to be a treasure land." ”

Lu Zhi picked up the pen to write and paint, "The equipment of Yan's salt field is relatively advanced, using an iron pot, round or square with a flat bottom, 4~5 feet in diameter, 7~8 inches in height, each pot can boil 7-10 liters of salt, about 5-6 hours to become salt.

The production of boiled salt is backward, the output is small, the labor productivity is low, and the cost is high, especially to consume a large amount of firewood, and it takes about 4 stones of firewood to cook 1 stone of salt. (Stone with the burden, a stone of firewood is a load of firewood)

Next, Lu Zhi wrote a bunch of formulas to express the cost of one stone of salt.

The old general looked confused, he was born as a military general, he really couldn't understand it, let alone him, even if he was a math master.

"That ......" Lu Zhi didn't dare to continue to show off, or the old general would have to beat people, "All in all, the boiled salt is expensive." ”

Old General Guan sneered, "Hehe, according to what you say, the Yan family was raided, and it was quite wronged?" ”

"Not wronged, not wronged, not wronged at all!" Who made him offend Ben Gongzi?

Lu Zhi looked righteous and said righteously, "The Yan family's gold and silver sea must have taken ill-gotten gains. ”

As soon as he said this, General Guan calmed down again, "Then what do you mean by kid?" ”

"Old man, do you know how the Yan family grabbed this ill-gotten gain?" Lu Zhi added an accent to "ill-gotten gains".

Old General Guan was patient, but just shook his head, "I don't know." ”

"It's the piece of land in Yan's salt farm!" Lu Zhi was a little excited, "I've calculated, if the Yan family only relies on making salt, they won't be able to earn so much silver at all!"

By the way, old man, do you know what other profitable business the Yan family has? ”

"Nope." General Guan Lao replied in the extreme affirmative, although he did not serve in the court, he was still well-informed.

"Then I'm even more sure." Lu Zhi wrote another formula on the paper: income - cost = profit

General Guan Lao entered a state of confusion again, but he was obviously aroused, and he was not so irritable that he wanted to hit someone.

"The amount of silver that the Yan family was copied out is huge, which means that the profit is very high." Lu Zhi drew an upward → on the word profit.

"Every year, the imperial court buys salt from the Yan family, and the price is lowered, so although the purchase of the Yan family is expensive, it is not much higher than that of others." As he spoke, he drew another "—" on the income.

"In other words, compared with other families, the income per stone of salt is about the same, but the profit is far exceeded, so what does it mean?"

Lu Zhi danced with his hands, because he was too excited, he was already a little slurred.

General Guan still didn't understand, "What? ”

"It means that it is low-cost!" With a stroke of his pen, Lu Zhi drew a big downward → on the cost.

After drawing the schematic diagram, it is clearer, Lu Zhi pointed to the cost, "The biggest cost of boiling salt is firewood, I have reason to suspect that Yan's salt farm has rich earth fire resources, and not much firewood is used when boiling salt." ”

There is no record of oil at all, and it will not be coal.

Although coal was discovered, it was known that it could burn, but no one dared to use it, "black stone" was extremely toxic, whoever burned it died!

General Guan finally understood, "No need to burn firewood? ”

"That's right!" Lu Zhi clapped his fists, "The biggest expense for boiling salt is gone, the Yan family is equivalent to pure income, do you think he can not be rich?" ”

General Guan was thoughtful, "No wonder! ”

…………

Palace.

King Yue was in a daze at a black-armored guard secret report.

Not long after copying Yan's house, he got this secret report, and it has been several days now.

Wei Zhong handed over a bowl of herbal tea, "Your Majesty, the court and the central government are in turmoil, and you still need to make a decision early!" ”

"yes!" King Yue drank herbal tea, and his mind cleared up a lot, "I really didn't expect that the Yan family would still hide such a big secret." ”

There is a stable and usable ground fire under the Yan's salt field, which is a national strategic resource.

King Yue was a little lucky, "Being able to boil salt can naturally smelt weapons, but fortunately, the Yan family didn't expect it, otherwise I'm afraid that I will mess up." ”

Wei Zhong felt that King Yue was a little worried, if you want to smelt weapons, it is not enough to have earth fire, you must have copper ore or iron ore, and it is in vain if you want to not be good earth fire.